Electrostatic nozzle and minimal quantity lubricating and grinding system for controllable jet

Abstract

An electrostatic nozzle and a minimal quantity lubricating and grinding system for a controllable jet. An electrostatic nozzle includes a nozzle core, an upper nozzle body being connected above the nozzle core; an empty space being formed between the upper nozzle body and the nozzle core for storing compressed air and decompression; a lower nozzle body being connected below the nozzle core; a gas-liquid mixing chamber, an acceleration chamber, and a nozzle outlet being sequentially disposed inside the nozzle core from top to bottom; and micro-convex bodies being evenly arranged on an inner wall of the acceleration chamber.

What is claimed is: 
     
       1. A contact-type electrostatic nozzle with a gradient micro-convex body, comprising: a nozzle core, an upper nozzle body being connected above the nozzle core; an empty space being formed between the upper nozzle body and the nozzle core for storing compressed air and decompression; a lower nozzle body being connected below the nozzle core; a gas-liquid mixing chamber, an acceleration chamber, and a nozzle outlet being sequentially disposed inside the nozzle core from top to bottom; and micro-convex bodies being evenly arranged on an inner wall of the acceleration chamber, and heights of the micro-convex bodies being non-equal-height to each other, that is, a height of each one of the micro-convex bodies each individually decreasing in height along a jet motion direction. 
     
     
       2. A minimal quantity lubricating and grinding system for a controllable jet, comprising:
 the contact-type electrostatic nozzle with a gradient micro-convex body according to  claim 1 . 
 
     
     
       3. The minimal quantity lubricating and grinding system for a controllable jet according to  claim 2 , further comprising:
 a grinding machine workbench, a grinding wheel being disposed above the grinding machine workbench, a grinding wheel cover being disposed outside the grinding wheel; a workpiece being disposed between the grinding machine workbench and the grinding wheel; a minimal quantity lubrication liquid delivery pipe being fixed on the grinding wheel cover, one end of the minimal quantity lubrication liquid delivery pipe being connected to the contact-type electrostatic nozzle, and the other end being connected to a minimal quantity lubrication device; 
 the electrostatic nozzle being further electrically connected to an adjustable high-voltage DC power supply, the adjustable high-voltage DC power supply being further electrically connected to a workpiece power-on device; and the workpiece power-on device being adsorbed on a non-processed surface of the workpiece, and the workpiece being connected to a positive electrode of the adjustable high-voltage DC power supply, so that the electrostatic nozzle is negative and a surface of the workpiece is positive, and an electric field is formed between the electrostatic nozzle and the workpiece to facilitate controllable delivery of minimal quantity lubrication droplets. 
 
     
     
       4. The minimal quantity lubricating and grinding system for a controllable jet according to  claim 2 , wherein a contraction angle α of an acceleration chamber is between 5-20°, a diameter of the nozzle outlet is B, a length of the nozzle outlet is L, and a value of L/B is from 2 to 6. 
     
     
       5. The minimal quantity lubricating and grinding system for a controllable jet according to  claim 2 , wherein the minimal quantity lubrication device comprises:
 a precision minimal quantity lubrication pump, a liquid inlet of the precision minimal quantity lubrication pump being disposed on the precision minimal quantity lubrication pump, a liquid inlet of the precision minimal quantity lubrication pump being in communication with an insulating oil cup, the insulating oil cup being configured to supply liquid to the precision minimal quantity lubrication pump; the precision minimal quantity lubrication pump being further in communication with a liquid suction air path and an atomization air path, the liquid suction air path and the atomization air path being both in communication with a compressed air source; the liquid suction air path being configured to control the precision minimal quantity lubrication pump to suck minimal quantity lubrication liquid in the insulating oil cup; and the atomization air path being configured to deliver atomized minimal quantity lubrication liquid. 
 
     
     
       6. The minimal quantity lubricating and grinding system for a controllable jet according to  claim 5 , wherein one end of the atomization air path is connected to a first inlet port of the lubrication pump, and the other end of the atomization air path is connected to a first port of a three-way valve; one end of the liquid suction air path is connected to a second inlet port of the lubrication pump, and the other end of the liquid suction air path is connected to a second port of the three-way valve; and a third port of the three-way valve is connected to the compressed air source through a pipeline. 
     
     
       7. The minimal quantity lubricating and grinding system for a controllable jet according to  claim 5 , wherein a grinding machine workbench is covered with an insulating plate.